113121210121 has 4 divisors (see below), whose sum is σ = 113482620052. Its totient is φ = 112759800192.

The previous prime is 113121210089. The next prime is 113121210133. The reversal of 113121210121 is 121012121311.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 29116303225 + 84004906896 = 170635^2 + 289836^2 .

It is a cyclic number.

It is not a de Polignac number, because 113121210121 - 2⁵ = 113121210089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 113121210095 and 113121210104.

It is not an unprimeable number, because it can be changed into a prime (113121210421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 180704496 + ... + 180705121.

It is an arithmetic number, because the mean of its divisors is an integer number (28370655013).

Almost surely, 2^113121210121 is an apocalyptic number.

It is an amenable number.

113121210121 is a deficient number, since it is larger than the sum of its proper divisors (361409931).

113121210121 is an equidigital number, since it uses as much as digits as its factorization.

113121210121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361409930.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 113121210121 its reverse (121012121311), we get a palindrome (234133331432).

The spelling of 113121210121 in words is "one hundred thirteen billion, one hundred twenty-one million, two hundred ten thousand, one hundred twenty-one".